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ROS evaluation for a series of CNTs and their derivatives using an ESR method with DMPO.

Authors
Tsuruoka-S; Takeuchi-K; Koyama-K; Noguchi-T; Endo-M; Tristan-F; Terrones-M; Matsumoto-H; Saito-N; Usui-Y; Porter-DW; Castranova-V
Source
J Phys: Conf Ser 2013 Apr; 429(1):012029
NIOSHTIC No.
20042613
Abstract
Carbon nanotubes (CNTs) are important materials in advanced industries. It is a concern that pulmonary exposure to CNTs may induce carcinogenic responses. It has been recently reported that CNTs scavenge ROS though non-carbon fibers generate ROS. A comprehensive evaluation of ROS scavenging using various kinds of CNTs has not been demonstrated well. The present work specifically investigates ROS scavenging capabilities with a series of CNTs and their derivatives that were physically treated, and with the number of commercially available CNTs. CNT concentrations were controlled at 0.2 through 0.6 wt%. The ROS scavenging rate was measured by ESR with DMPO. Interestingly, the ROS scavenging rate was not only influenced by physical treatments, but was also dependent on individual manufacturing methods. Ratio of CNTs to DMPO/ hydrogen peroxide is a key parameter to obtain appropriate ROS quenching results for comparison of CNTs. The present results suggest that dangling bonds are not a sole factor for scavenging, and electron transfer on the CNT surface is not clearly determined to be the sole mechanism to explain ROS scavenging.
Keywords
Nanotechnology; Exposure-levels; Risk-factors; Hazards; Health-hazards; Workers; Work-environment; Pulmonary-system; Pulmonary-system-disorders; Pulmonary-function; Exposure-levels; Risk-factors; Carcinogens; Respiratory-system-disorders; Respiration; Free-radicals; Free-radical-generation
Publication Date
20130401
Document Type
Journal Article
Email Address
s_tsuruoka@shinshu-u.ac.jp
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
B20130531
Issue of Publication
1
NIOSH Division
HELD
Priority Area
Manufacturing
Source Name
Journal of Physics: Conference Series
State
WV
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